
<h1><span class="yiyi-st" id="yiyi-12">numpy.delete</span></h1>
        <blockquote>
        <p>原文：<a href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.delete.html">https://docs.scipy.org/doc/numpy/reference/generated/numpy.delete.html</a></p>
        <p>译者：<a href="https://github.com/wizardforcel">飞龙</a> <a href="http://usyiyi.cn/">UsyiyiCN</a></p>
        <p>校对：（虚位以待）</p>
        </blockquote>
    
<dl class="function">
<dt id="numpy.delete"><span class="yiyi-st" id="yiyi-13"> <code class="descclassname">numpy.</code><code class="descname">delete</code><span class="sig-paren">(</span><em>arr</em>, <em>obj</em>, <em>axis=None</em><span class="sig-paren">)</span><a class="reference external" href="http://github.com/numpy/numpy/blob/v1.11.3/numpy/lib/function_base.py#L4121-L4320"><span class="viewcode-link">[source]</span></a></span></dt>
<dd><p><span class="yiyi-st" id="yiyi-14">返回具有沿着轴删除的子数组的新数组。</span><span class="yiyi-st" id="yiyi-15">对于一维数组，这返回未由<em class="xref py py-obj">arr [obj]</em>返回的条目。</span></p>
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<tr class="field-odd field"><th class="field-name"><span class="yiyi-st" id="yiyi-16">参数：</span></th><td class="field-body"><p class="first"><span class="yiyi-st" id="yiyi-17"><strong>arr</strong>：array_like</span></p>
<blockquote>
<div><p><span class="yiyi-st" id="yiyi-18">输入数组。</span></p>
</div></blockquote>
<p><span class="yiyi-st" id="yiyi-19"><strong>obj</strong>：slice，int或int的数组</span></p>
<blockquote>
<div><p><span class="yiyi-st" id="yiyi-20">指示要删除的子数组。</span></p>
</div></blockquote>
<p><span class="yiyi-st" id="yiyi-21"><strong>axis</strong>：int，可选</span></p>
<blockquote>
<div><p><span class="yiyi-st" id="yiyi-22">要删除由<em class="xref py py-obj">obj</em>定义的子阵列的轴。</span><span class="yiyi-st" id="yiyi-23">如果<em class="xref py py-obj">axis</em>为None，则<em class="xref py py-obj">obj</em>应用于展平的数组。</span></p>
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<tr class="field-even field"><th class="field-name"><span class="yiyi-st" id="yiyi-24">返回：</span></th><td class="field-body"><p class="first"><span class="yiyi-st" id="yiyi-25"><strong>out</strong>：ndarray</span></p>
<blockquote class="last">
<div><p><span class="yiyi-st" id="yiyi-26">删除了由<em class="xref py py-obj">obj</em>指定的元素的<em class="xref py py-obj">arr</em>副本。</span><span class="yiyi-st" id="yiyi-27">请注意，<a class="reference internal" href="#numpy.delete" title="numpy.delete"><code class="xref py py-obj docutils literal"><span class="pre">delete</span></code></a>不会原地发生。</span><span class="yiyi-st" id="yiyi-28">如果<em class="xref py py-obj">axis</em>为None，则<em class="xref py py-obj">out</em>是一个展平的数组。</span></p>
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</tr>
</tbody>
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<div class="admonition seealso">
<p class="first admonition-title"><span class="yiyi-st" id="yiyi-29">也可以看看</span></p>
<dl class="last docutils">
<dt><span class="yiyi-st" id="yiyi-30"><a class="reference internal" href="numpy.insert.html#numpy.insert" title="numpy.insert"><code class="xref py py-obj docutils literal"><span class="pre">insert</span></code></a></span></dt>
<dd><span class="yiyi-st" id="yiyi-31">将元素插入数组。</span></dd>
<dt><span class="yiyi-st" id="yiyi-32"><a class="reference internal" href="numpy.append.html#numpy.append" title="numpy.append"><code class="xref py py-obj docutils literal"><span class="pre">append</span></code></a></span></dt>
<dd><span class="yiyi-st" id="yiyi-33">在数组末尾追加元素。</span></dd>
</dl>
</div>
<p class="rubric"><span class="yiyi-st" id="yiyi-34">笔记</span></p>
<p><span class="yiyi-st" id="yiyi-35">通常优选使用布尔掩码。</span><span class="yiyi-st" id="yiyi-36">例如：</span></p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="n">mask</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">ones</span><span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="n">arr</span><span class="p">),</span> <span class="n">dtype</span><span class="o">=</span><span class="nb">bool</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">mask</span><span class="p">[[</span><span class="mi">0</span><span class="p">,</span><span class="mi">2</span><span class="p">,</span><span class="mi">4</span><span class="p">]]</span> <span class="o">=</span> <span class="kc">False</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">result</span> <span class="o">=</span> <span class="n">arr</span><span class="p">[</span><span class="n">mask</span><span class="p">,</span><span class="o">...</span><span class="p">]</span>
</pre></div>
</div>
<p><span class="yiyi-st" id="yiyi-37">等效于<em class="xref py py-obj">np.delete（arr，[0,2,4]，axis = 0）</em>，但允许进一步使用<em class="xref py py-obj">掩码</em>。</span></p>
<p class="rubric"><span class="yiyi-st" id="yiyi-38">例子</span></p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="n">arr</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">array</span><span class="p">([[</span><span class="mi">1</span><span class="p">,</span><span class="mi">2</span><span class="p">,</span><span class="mi">3</span><span class="p">,</span><span class="mi">4</span><span class="p">],</span> <span class="p">[</span><span class="mi">5</span><span class="p">,</span><span class="mi">6</span><span class="p">,</span><span class="mi">7</span><span class="p">,</span><span class="mi">8</span><span class="p">],</span> <span class="p">[</span><span class="mi">9</span><span class="p">,</span><span class="mi">10</span><span class="p">,</span><span class="mi">11</span><span class="p">,</span><span class="mi">12</span><span class="p">]])</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">arr</span>
<span class="go">array([[ 1,  2,  3,  4],</span>
<span class="go">       [ 5,  6,  7,  8],</span>
<span class="go">       [ 9, 10, 11, 12]])</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">np</span><span class="o">.</span><span class="n">delete</span><span class="p">(</span><span class="n">arr</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">0</span><span class="p">)</span>
<span class="go">array([[ 1,  2,  3,  4],</span>
<span class="go">       [ 9, 10, 11, 12]])</span>
</pre></div>
</div>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="n">np</span><span class="o">.</span><span class="n">delete</span><span class="p">(</span><span class="n">arr</span><span class="p">,</span> <span class="n">np</span><span class="o">.</span><span class="n">s_</span><span class="p">[::</span><span class="mi">2</span><span class="p">],</span> <span class="mi">1</span><span class="p">)</span>
<span class="go">array([[ 2,  4],</span>
<span class="go">       [ 6,  8],</span>
<span class="go">       [10, 12]])</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">np</span><span class="o">.</span><span class="n">delete</span><span class="p">(</span><span class="n">arr</span><span class="p">,</span> <span class="p">[</span><span class="mi">1</span><span class="p">,</span><span class="mi">3</span><span class="p">,</span><span class="mi">5</span><span class="p">],</span> <span class="kc">None</span><span class="p">)</span>
<span class="go">array([ 1,  3,  5,  7,  8,  9, 10, 11, 12])</span>
</pre></div>
</div>
</dd></dl>
